The glue sold at home centers for attaching the PVC plumbing bonds the plastic together quite well and is fairly inexpensive to boot. There is a cleaner as well (typically sold right next to it) and aside from a nasty smell they set quickly and are easy to use. With the PVC plumbing, it seems the tubing is as likely to break as the joint if you try to seperate a joint that did not set in the right direction....